Charles l



uitrit taten @anni 'fitta CHARLES L. ZEIDLER, OF CINCINNATI, OHIO.' v Letters Patent No. 70,771, dated November 12, 1867'. I

IMPROVEMENT IN MORTISING MACHINES.

TO WHOM IT MAY CONCERN:

Beit known that I, CHARLESL. ZEIDLER, of Cincinnati, Hamilton county, Ohio, have invente'd a newl and useful Improvement in Mortising Machines; I and I hereby declare the following to be a full,'-clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

This is an improvement in the class' oi' wood-mortising machines, actuated by steam or other power, whose chisel-stroke is placed under momentary conti-olaf the operator, so as to be increased or'diminished, or reduced to'a state of rest at will, without disconnection from the motor; and my devices are designed, first, to causeA the variation of chisel action to respond to the slightest movement of the regulating treadle with less jante the operator than heretofore; second, to insure, when desired, an automatic reverse of the chisel rfrom right to left and left to right. y

Figure 1 is a front elevation of a machine embodying my invention. l

Figure 2 is a front elevation of the upper part, showing a modification of my invention.

Figure 3 is a rear view of the post.

Figure 4 is an enlarged horizontal section taken at the line XX.

A is a post, preferably of cast iron, and with transverse section, such as seen in iig. 4, so as to have a recess, A', on its rear side for a portion of the reversing and retractingvmechanism, as hereafter explained. B is the lower and B' the upper of two guides for the chisel-bar or stem C. Journalied horizontally to the postA is a bell-crank, D, one of whose limbs d is connected by pitmamE to driving-crank or disk F. Hinged to the other limb al' of the said bell-crank is an arm, Gr, whose l.free extremity is on one side connected by pitman H'to a sleeve or box, I, which encireles the stem C between two collars c and c' upon the same, and on the etl'r side is connected by pitman' H' witha rock-armi, whose lower extremity has a wrist, K, that occupies an 'oblique slot, l, in a slide, L, which is restricted to a vertical reciprocation by lguides M upon the post. The slide L is upheld at its normal or resting 4position by a strong spiral spring, N, within the recess A', .and is capable of being depressed for action by means` of a treadle', O, connected to the slide by a rod, P. Q is a. thimble, journalled within the lower guide B, and encircling a sleeve, R, whose tongue r occupies a groove, e",in the stem C, so that the stem, while capable of sliding up y,or down within lthe said sleeve, is compelled to rotate with it. Sis

a catch havin a s rin S', which forces it to' en are in a notch, r', inthe sleeve, andthus holds said sleeve g P g g a and its contained stem against-reversal until liberatedr Attached to the thimbleQ is a bent spring, T, having a pin, trwhich, traversing one side of the`thimble, engages alternately 'in one or other of two notches r" r'"v on opposite sides of the sleeve R'. The thimble Q has a circumferential score, q, within which is fastened a thong or cord, U, one end, u, of which. is carried backward and fastened underneath a sheave or pulley, V, while the l other end, being also carried backward and over a score, u, on said sheave, terminates in a'spiral spring, W, whose lower end is secured to the foot of the post. The sheaveV'carries a pinion, V', which engages in a rack,

Z', on the slide L. y N is a strong spiral spring, which being fastened by its lower end to the slide L, and by its v upper end\to the top of the post A, serves to counterpoise thc weight of the said slide and its accessories, and, on their release by the operator, to restore them to their normal position. The rear end of the catch within the foot carries a trigger, X, which yields readily to the descent of a spur or tappet, l", upon-'the slide'L, but which on. the ascent of said slide becomes forced laterally backward by the said spur, and acts to disengage the catch S from the sleeve R, and to allow the spring lw, actingthrough the now highly stretched cord, to ee'ct arapid,

semi-rotation of the sleeve and stem, and the engagement of the catch lS and pin tin the oppositenotches. The trigger X is restored to its normal position by a spring, Y. l A customary adjustable table, Z, is provided for the stuff. In fig. 2 is seen a modicatiomin which the angle of the slot Z is reversed, andthe pitman H is hinged to a sliding-block, J'. i

Operation. v

The disk F being set in motion, the stuff to be mortised is laid on table Z, and the ltrendle is depresifted'v by the operators foot, so as move the arm to the right, and to oblige its wrist g to take part in the vibra: `tions of the bell-crank D. VA less orgreater displacement of the arm G is made, according to the desired stroke of thewchisel. It will beseen that all the movements of the wrist g are in parts of circles and around centres,I and consequently areie'ected without restraint, detention, or lostrnotion,l and with little labor to `the operator,

and that wrist K, occupying the oblique slot l, is held positively and immovably to its work without jarring the operator. It is also apparent that the treadle may he depressed as often as desired, without reversing the chisel, the latter action following only upon a full strokeof the chisel, resulting from a complete depression of the treadle, as it is only under these conditions that the spur Z becomes operative on the trigger movemen l: so as to release the sleeve and to permitthe spring W to come into play for the semi-rotaton of the stem.

I do not broadly claim the changing of the stroke of the chisel-bar by means of a crank and connecting devices; hut I claim herein as new, and of .my invention- 1. The arrangement of continuously vibrated bell-crank D, having the arm G and wrist y connected on one side by pitman H to the chisel-bar, and on the other side to a. wrist, K, actuated by an obliquely slotted slide, L, under control of the operator, constructed and operating substantially as and for the purpose s t forth.

2. The arrangement of fast and loose sleeves Q and R upon the chisel-shaft or stem, engaging a :d releasing pawls or 'catches S and T, cord U, and pulley V, in combination with the catch or trigger X, and tappet Z, rack and pinion vl, and actuating and balancing-springs W and N, constructed and operating substantially as and for the purpose set forth.

In testimony of which invention I hereunto set my hand.

C. L. ZEIDLER Witnesses:

Guo. H. KNIGHT, JAMES H. LAYMAN. 

